The Cole-Parmer TR-200D tube rotator has a variable rotational speed between 2 and 40rpm. With on/off switch, digital speed control to 1rpm resolution and LED display, 1 to 999 minute timer with audible alarm at the end of the timed period and adjustable tilt angle with setting gauge. Overall 200 x 270 x 230mm W x D x H. Weight 3.2kg. For 230V 50Hz single phase supplies. Requires, but is not supplied with, tube carrier for operation.